Bat-tail file



N.PETERS, PHOTO-LITHOGRAPHEH, WASNI-NGTOMID C.

UNTTED sTATEs PATENT oFFrcE- RICHARD FLINT, OF MERIDEN, CONNECTICUT.

RAT-TAIL FILE.

Specification of Letters Patent No. 4,660, dated July 24, 1846.

T all 'whom t may concern.'

Be it known that I, RICHARD FLINT, of Meriden, in the county of NewHaven and State of Connecticut, have invented a new and Improved File;and I do hereby de- Clare that the following is a full and exactdescription.

The nature of my invention consists in the cut of the file.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction, I make my files by cutting athread With clamp screw dies or by any of the known forms of cutting ascrew tap, where a taper file is wanted I prefer cutting them in anengine as the feed can in that case be easily graduated, producing anequality of the thread through the large and small parts of the iile,and for a double cut iile I use a right and left hand thread.

Figure l, A A is a plan of a file cut as above described, the dark partof the figure represents the double cut part of the file,

the engine and use a ner thread in the'die,

for the left hand cut.

What I claim as my invention and desire to secure by Letters Patent is Around file or files cut by means of a right and left hand screw, orscrews, substantially as above set forth.

- RICHARD FLINT.

Witnesses S. SMITH, L. GOODWIN.

